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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="Promise.js"></script>
</head>

<body>
    <script>
        let p = new Promise((resolve, reject) => {
            // setTimeout(()=>{
            //     reject('ok')
            // },1000);
            reject('ok');
        })
        let result = p.then(value=>{
            // 1. return 123 : 
            // return new Promise((resolve,reject)=>{
            //     setTimeout(()=>{
            //         // resolve('ok123');
            //         reject('error')
            //     },2000);
            // })
            // 3. throw'
            throw 123;
        },reason=>{
            console.log('reason',reason);
            return new Promise((resolve,reject)=>{
                setTimeout(()=>{
                    resolve('999');
                },1000);
            })
        })
        console.log('result',result);
    </script>

</body>

</html>